Derivative Financial Instruments (Narrative) (Detail)	3 Months Ended	9 Months Ended
	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) derivativeInstrument	Jun. 30, 2022 USD ($) derivativeInstrument	Dec. 31, 2021 derivativeInstrument	Sep. 30, 2021 derivativeInstrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months		$ 4,300,000
Net derivative liability position, aggregate fair value		0
Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months		20,500,000
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 190,000,000
Number of derivative instruments held | derivativeInstrument		3		0	0
Not designated as hedging instrument | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 0
Not designated as hedging instrument | Interest rate contract terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		1,000,000,000
Not designated as hedging instrument | Interest rate contract, qualified borrowers
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		9,300,000,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		209,200,000
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		493,800,000
Not designated as hedging instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 281,000,000
Not designated as hedging instrument | Covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivativeInstrument		0		0	0
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Total Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivativeInstrument		1
Notional amount		$ 3,064,286,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing March 2023
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 1,000,000,000
Derivative term	5 years
Fair value of derivative contracts	$ 66,500,000	3,700,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing April 2024
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 500,000,000
Fair value of derivative contracts		$ 10,700,000
Number of derivative instruments held | derivativeInstrument			2
Interest rate derivatives designated as Fair Value Hedges | Designated as hedging instrument | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivativeInstrument		14
Notional amount		$ 205,400,000